Kumngern, Montree

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Kumngern, Montree
Alternative Name
KUMNGERN, Montree
Kumngern, M.
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Email
montree.ku@kmitl.ac.th

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    Item type:Publication,
    Electronically tunable current-mode quadrature oscillator using current differencing transconductance amplifiers
    (2009-12-01)
    Kumngern, Montree
    ;
    Dejhan, Kobchai
    A new electronically tunable single-element-controlled current-mode quadrature oscillator circuit using current differencing transconductance amplifiers (CDTAs) is presented. The proposed oscillator is consisted of two CDTAs, two grounded capacitors and one grounded resistor, which is beneficial to monolithic integrated circuit implementation. The oscillation condition and oscillation frequency of the circuit are independently controllable. Also, the oscillation frequency can be controlled by a bias current of CDTA. The realized of the circuit provides four quadrature current outputs at high output impedance nodes. PSPICE simulation results that confirm the theoretical predictions are given. © 2009 IEEE.
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    Current-mode quadrature oscillator using current differencing transconductance amplifiers
    (2012-07-01)
    Kumngern, Montree
    ;
    Lamun, Panit
    ;
    Dejhan, Kobchai
    This article presents a new electronically tunable single-element-controlled current-mode quadrature sinusoidal oscillator circuit using current differencing transconductance amplifiers (CDTAs). The proposed oscillator is consisted of two CDTAs, two grounded capacitors and one grounded resistor, which is beneficial to monolithic integrated circuit implementation both in CMOS and bipolar technologies. The condition of oscillation and the frequency of oscillation are independently controllable. The frequency of oscillation can also be electronically controlled by adjusting the bias current of CDTA. The circuit provides four quadrature current outputs and two quadrature voltage outputs. The current output terminals possess high impedance level. PSPICE simulation results are used to verify the performance of the proposed circuit implemented at the transistor level. The measurement results support the computer simulations.